The alkali feldspars from microsyenitic dylces of southern
Summary. 26 b-axis oscillation photographs of alkali feldspars of microsyenitic dykes of Southern Greenland are presented. The crystals are rather estricted in composition (Or42. ~ to 0r35.3) but are rather ich in Ca (up to 14 % An). The range of variation of the optic axial angles, 2V 45 ~ to 71 ~...
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1966
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.608.3519 2023-05-15T16:27:40+02:00 The alkali feldspars from microsyenitic dylces of southern H. G. Scttarbert Ph. D The Pennsylvania State University CiteSeerX Archives 1966 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.608.3519 http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.608.3519 http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf text 1966 ftciteseerx 2016-01-08T14:22:27Z Summary. 26 b-axis oscillation photographs of alkali feldspars of microsyenitic dykes of Southern Greenland are presented. The crystals are rather estricted in composition (Or42. ~ to 0r35.3) but are rather ich in Ca (up to 14 % An). The range of variation of the optic axial angles, 2V 45 ~ to 71 ~ (exceptions up to 87 ~ puts the crystals between sanidine-anorthoclase cryptoperthite and orthoclase microper-thite, as classified by Turtle (1952). Since the syenitic magma cooled own rather apidly some peculiarities in the structural state of the alkali feldspars are to be expected. The potassium-rich p ase is (nearly) monoclinic. According to the values of the reciprocal lattice angles a * and y * the sodium-rich phases can be divided into three groups: high-temperature pericline-twinned and high-temperature albite-twinned phases, high-tempera-ture pericline-twinned and low-temperature albite-twinned phases, and high-tem-perature perieline-twinned and low-temperature albibe-twinned phases with nearly identical values of the reciprocal lattice angle V*. I N 1938 Wegmann established the structural division of the Pre- cambrian of southern Greenland by introducing the concepts of Text Greenland Unknown Greenland |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Summary. 26 b-axis oscillation photographs of alkali feldspars of microsyenitic dykes of Southern Greenland are presented. The crystals are rather estricted in composition (Or42. ~ to 0r35.3) but are rather ich in Ca (up to 14 % An). The range of variation of the optic axial angles, 2V 45 ~ to 71 ~ (exceptions up to 87 ~ puts the crystals between sanidine-anorthoclase cryptoperthite and orthoclase microper-thite, as classified by Turtle (1952). Since the syenitic magma cooled own rather apidly some peculiarities in the structural state of the alkali feldspars are to be expected. The potassium-rich p ase is (nearly) monoclinic. According to the values of the reciprocal lattice angles a * and y * the sodium-rich phases can be divided into three groups: high-temperature pericline-twinned and high-temperature albite-twinned phases, high-tempera-ture pericline-twinned and low-temperature albite-twinned phases, and high-tem-perature perieline-twinned and low-temperature albibe-twinned phases with nearly identical values of the reciprocal lattice angle V*. I N 1938 Wegmann established the structural division of the Pre- cambrian of southern Greenland by introducing the concepts of |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
H. G. Scttarbert Ph. D |
spellingShingle |
H. G. Scttarbert Ph. D The alkali feldspars from microsyenitic dylces of southern |
author_facet |
H. G. Scttarbert Ph. D |
author_sort |
H. G. Scttarbert |
title |
The alkali feldspars from microsyenitic dylces of southern |
title_short |
The alkali feldspars from microsyenitic dylces of southern |
title_full |
The alkali feldspars from microsyenitic dylces of southern |
title_fullStr |
The alkali feldspars from microsyenitic dylces of southern |
title_full_unstemmed |
The alkali feldspars from microsyenitic dylces of southern |
title_sort |
alkali feldspars from microsyenitic dylces of southern |
publishDate |
1966 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.608.3519 http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.608.3519 http://www.minersoc.org/pages/Archive-MM/Volume_35/35-275-903.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766017128306049024 |